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    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>第四课 策略模式</title>
</head>

<body>
    <script>
        var calcFn = function(level,money){
            if(level == 'A+'){
                return money * 3;
            }
            if(level == 'A'){
                return money * 2;
            } 
            if(level == 'B'){
                return money * 1.5;
            }
            if(level == 'C'){
                return money * 1;
            } 
            if(level == 'D'){
                return money * 0.8;
            }                                               
        }
        console.log(calcFn('B',10000));//15000
    </script>
</body>

</html>